4.2 - Summarize cloud computing concepts.

Question 1

Private Cloud

Answer 1

A private cloud is a cloud environment used exclusively by a single organization.

Characteristics:

Greater control

Higher security

Higher cost

Common in:

Government organizations

Large enterprises

Healthcare environments

Think:
Private cloud = internal company cloud

Question 2

Public Cloud

Answer 2

A public cloud is owned and operated by a third-party cloud provider and shared by many customers.

Characteristics:

Highly scalable

Lower cost

Accessible over the internet

Examples include services offered by major cloud providers.

Think:
Public cloud = shared infrastructure

Question 3

Hybrid Cloud

Answer 3

A hybrid cloud combines private and public cloud environments.

Characteristics:

Sensitive data can remain in private cloud

Other workloads can run in public cloud

Flexible resource management

Example:
A company stores sensitive data internally but runs web services in the public cloud.

Think:
Hybrid = mix of public and private

Question 4

Community Cloud

Answer 4

A community cloud is shared by multiple organizations with similar requirements.

Common users:

Government agencies

Research institutions

Healthcare organizations

Purpose:
Share infrastructure among organizations with common goals or regulations.

Question 5

IaaS (Infrastructure as a Service)

Answer 5

IaaS provides virtualized hardware resources.

The provider manages:

Physical servers

Networking

Storage

The customer manages:

Operating system

Applications

Data

Common uses:

Virtual machines

Cloud servers

Think:
IaaS = rent the hardware

Question 6

PaaS (Platform as a Service)

Answer 6

PaaS provides a development platform for building applications.

The provider manages:

Hardware

Operating system

Development tools

Runtime environment

Developers manage:

Applications

Code

Common uses:

Software development platforms

Think:
PaaS = build applications

Question 7

SaaS (Software as a Service)

Answer 7

SaaS provides fully managed software applications delivered through the internet.

The provider manages everything:

Infrastructure

Operating system

Application software

Users simply access the application.

Common uses:

Email platforms

Office applications

Web-based software

Think:
SaaS = use the software

Question 8

Cloud Characteristics

Answer 8

These are the features that define cloud computing environments.

Question 9

Shared Resources vs Dedicated Resources

Answer 9

Shared resources allow multiple customers to use the same cloud infrastructure.

Benefits:

Lower cost

Efficient resource use

Dedicated resources provide exclusive hardware for a single customer.

Benefits:

Greater security

Predictable performance

Question 10

Metered Utilization

Answer 10

Cloud services often charge based on actual resource usage.

Examples include:

Storage used

Compute time

Data transfer

This is often called pay-as-you-go pricing.

Question 11

Ingress / Egress

Answer 11

These terms describe data transfer in and out of the cloud.

Ingress:
Data entering the cloud.

Egress:
Data leaving the cloud.

Important concept:
Egress traffic may incur additional costs.

Question 12

Elasticity

Answer 12

Elasticity allows cloud systems to automatically scale resources up or down depending on demand.

Example:
A website automatically adding more servers during high traffic periods.

Think:
Elasticity = automatic scaling

Question 13

Availability

Answer 13

Cloud providers aim to deliver high uptime and reliability.

High availability ensures services remain operational even if hardware failures occur.

Often achieved through:

Redundant systems

Multiple data centers

Question 14

File Synchronization

Answer 14

Cloud services allow files to automatically sync across devices.

Example:
Editing a document on a laptop and accessing the updated version on a phone.

Common uses:

Cloud storage services

Collaboration tools

Question 15

Multitenancy

Answer 15

Multitenancy means multiple customers share the same cloud infrastructure.

Each customer’s data and applications remain logically isolated.

Benefits:

Efficient resource use

Lower operational costs

Think:
Shared environment with isolated users

Question 16

High-Yield Comparison

Answer 16

Model Purpose
Private Cloud Dedicated to one organization
Public Cloud Shared cloud provider infrastructure
Hybrid Cloud Mix of private and public
Community Cloud Shared by similar organizations
IaaS Rent virtual infrastructure
PaaS Development platform
SaaS Fully managed software

Question 17

Common CompTIA Scenario Triggers

Answer 17

Company hosts sensitive data internally but uses public cloud for apps → Hybrid cloud

Cloud platform for developing applications → PaaS

Web-based software accessed through browser → SaaS

Virtual machines hosted in cloud → IaaS

Pay only for resources used → Metered utilization

Automatic scaling during high demand → Elasticity

Multiple organizations sharing infrastructure → Multitenancy